Cloudflare Workers Observability MCP server

This MCP server implements the Model Context Protocol (MCP) with built-in Cloudflare OAuth, allowing you to gain insights into your Cloudflare Workers through remote connections. It provides tools for analyzing Workers performance, discovering available data fields, and exploring specific values in your logs.

Available Tools

The server currently offers these tools:

• Query Worker Observability - Analyzes logs and metrics from your Cloudflare Workers, allowing you to list events, calculate metrics, and find specific invocations
• Observability Keys - Discovers available data fields in your Workers logs, including metadata, worker-specific, and custom logged fields
• Observability Values - Finds available values for specific fields to help build precise filters for analytics queries

Example Prompts

• "Can you tell me about any potential issues on this particular worker 'my-worker-name'?"
• "Show me the CPU time usage for my worker 'api-gateway' over the last 24 hours"
• "What were the top 5 countries by request count for my worker yesterday?"
• "How many requests were made to my worker 'my-app' broken down by HTTP status code?"
• "Compare the error rates between my production and staging workers"

Connecting to the Remote MCP Server

Using MCP Clients with Native Support

If your MCP client directly supports remote MCP servers:

1. Enter the server URL: https://observability.mcp.cloudflare.com
2. The client interface will guide you through the authentication process

Using Other MCP Clients

For clients without native remote server support:

1. Install the mcp-remote package:

npm install mcp-remote

2. Set up the client's configuration file with the following content:

{
    "mcpServers": {
        "cloudflare": {
            "command": "npx",
            "args": ["mcp-remote", "https://observability.mcp.cloudflare.com/sse"]
        }
    }
}

3. Restart your MCP client
4. Complete the OAuth authentication flow in the browser window that opens
5. After authentication, the tools will become available in your client

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "cloudflare" '{"command":"npx","args":["mcp-remote","https://observability.mcp.cloudflare.com/sse"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "cloudflare": {
            "command": "npx",
            "args": [
                "mcp-remote",
                "https://observability.mcp.cloudflare.com/sse"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "cloudflare": {
            "command": "npx",
            "args": [
                "mcp-remote",
                "https://observability.mcp.cloudflare.com/sse"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect